{"schema":"threatline.record/2","record":{"id":"CVE-2026-98171","aliases":[],"summary":"smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs\n\nFix several related bounds checking and pointer lifecycle issues in\nreceive_encrypted_standard()'s handling of compound encrypted frames:\n\n- Clear next_buffer after assigning it to server->bigbuf. A stale\n  next_buffer pointer can lead to a use-after-free on subsequent\n  error paths.\n- Update pdu_length to the decrypted plaintext size (buf_size). Using\n  the pre-decryption length allows NextCommand to point into stale\n  ciphertext residue.\n- Reject next_cmd values smaller than MID_HEADER_SIZE(server).\n- Fix an integer overflow in the upper bound check by verifying\n  pdu_length - next_cmd < MID_HEADER_SIZE(server), ensuring the\n  trailing slice is large enough for a header.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98171","source_modified_at":"2026-10-19T09:15:02.660Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","lessThan":"72eaef1f37a3b6bec11c342736834dc3707be3e4","status":"affected","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","lessThan":"491e33144dee872cffda207f6fcb09260728f803","status":"affected","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","lessThan":"8749946579708ea0d339034bb7f423a67dbe89cf","status":"affected","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","lessThan":"96c436e4b010711452b2872558938f4ef276492a","status":"affected","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","lessThan":"858d5ac22cb889266993e7670f9f0c4f4aeedd78","status":"affected","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","lessThan":"05762c5bc1cfdcac36747994fde2c04387a457f1","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98171","source_modified_at":"2026-10-19T09:15:02.660Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.19","status":"affected"},{"version":"0","lessThan":"4.19","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98171","source_modified_at":"2026-10-19T09:15:02.660Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"72eaef1f37a3b6bec11c342736834dc3707be3e4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98171","source_modified_at":"2026-10-19T09:15:02.660Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"491e33144dee872cffda207f6fcb09260728f803","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98171","source_modified_at":"2026-10-19T09:15:02.660Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"8749946579708ea0d339034bb7f423a67dbe89cf","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98171","source_modified_at":"2026-10-19T09:15:02.660Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"96c436e4b010711452b2872558938f4ef276492a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98171","source_modified_at":"2026-10-19T09:15:02.660Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"858d5ac22cb889266993e7670f9f0c4f4aeedd78","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98171","source_modified_at":"2026-10-19T09:15:02.660Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"05762c5bc1cfdcac36747994fde2c04387a457f1","basis":"first unaffected version stated in the CVE record"}],"cvss":8.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00506,"percentile":0.42352,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:44:15.927Z","modified_at":"2026-10-19T09:15:02.660Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98171","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:15:02.660Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98171","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cf"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/05762c5bc1cfdcac36747994fde2c04387a457f1"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:15:02.660Z","content_hash":"a76f552b52d41becfd29dc17caf047bbee1330916fa0b6877c3c6ca0ef55a26a"}}